CN114839781A - Head-mounted display - Google Patents
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Abstract
A head mounted display, comprising: a display module and an optical module. The optical module is arranged on the light-emitting side of the display module. The optical module comprises in order along the light-emitting direction of the display module: a first lens unit, a first phase retarder, a second lens unit, and a linear polarizer. The first lens unit comprises a first curved lens and a first semi-transparent and semi-reflective layer, the first curved lens is provided with a first surface facing the display module and a second surface departing from the display module, and the first semi-transparent and semi-reflective layer is arranged on the first surface. The second lens unit comprises a second curved lens and a second semi-transparent and semi-reflective layer, the second curved lens is provided with a third surface facing the first phase retarder and a fourth surface facing away from the first phase retarder, and the second semi-transparent and semi-reflective layer is arranged on the fourth surface. The head-mounted display of the present disclosure can make the light from the display module reflect multiple times in the optical module and reduce the overall thickness of the optical module.
Description
Technical Field
The present disclosure relates to head mounted displays, and more particularly to the placement of optical modules in head mounted displays.
Background
The head-mounted display is matched with the three-dimensional lens optical module and the display module, and then a virtual world of a three-dimensional space is generated by computer analogy, so that the sense analogy of vision and the like of a user is provided, and the user feels as if the user is a virtual reality of the situation. By the position and angle of the camera image and the image analysis technology, the virtual world on the screen can be combined with the real world scene and the augmented reality of the interaction technology is realized.
The conventional three-dimensional lens optical module utilizes a laminated combination of a multilayer lens, a quarter wave plate and a semi-transparent reflective polarizer to reflect light emitted by a panel of a display twice in the three-dimensional lens optical module, thereby reducing the overall thickness of the system module.
However, the imaging quality is poor due to the large Waviness (Waviness) of the lens and the surface of the transflective polarizer. In addition, since the transflective polarizers are available and expensive from only a few companies (e.g., 3M companies), and the yield of the concave surface of the lens is not high, there is a need for a solution that can improve the imaging quality and the manufacturing cost of the head-mounted display.
Disclosure of Invention
In view of the foregoing, some embodiments of the present disclosure provide a head-mounted display whose optical module can improve the optical viewing effect and reduce the manufacturing cost without providing a transflective polarizer.
Some embodiments of the present disclosure provide a head mounted display, comprising: a display module and an optical module. The optical module sets up in the light-emitting side of this display module assembly, and the optical module includes according to the preface in the light-emitting direction of display module assembly: the optical lens includes a first lens unit, a first phase retarder, a second lens unit, and a linear polarizer. The first lens unit comprises a first curved lens and a first semi-transparent and semi-reflective layer, the first curved lens is provided with a first surface facing the display module and a second surface departing from the display module, and the first semi-transparent and semi-reflective layer is arranged on the first surface. The second lens unit comprises a second curved lens and a second semi-transparent and semi-reflective layer, the second curved lens is provided with a third surface facing the first phase retarder and a fourth surface facing away from the first phase retarder, and the second semi-transparent and semi-reflective layer is arranged on the fourth surface.
In some embodiments, in the head-mounted display, the first curved lens is a convex-concave lens, a first surface of the first curved lens facing the display module is a convex surface, and a second surface of the first curved lens facing away from the display module is a concave surface.
In some embodiments, in the head-mounted display, the second curved lens is a convex-concave lens, a third surface of the second curved lens facing the first retarder is a convex surface, and a fourth surface of the second curved lens facing away from the first retarder is a concave surface.
In some embodiments, the first transflective film has a transmittance of 50% ± 10% and a reflectance of 50 ± 10% in the head-mounted display.
In some embodiments, in the head-mounted display, the second transflective film has a transmittance of 50% ± 10% and a reflectance of 50 ± 10%.
In some embodiments, the head-mounted display further includes a third lens unit disposed on a side of the linear polarizer opposite to the second lens unit in the light-emitting direction of the display module.
In some embodiments, in the head-mounted display, the second transflective layer directly contacts the second curved lens of the second lens unit.
In some embodiments, in a head-mounted display, no transflective polarizer is disposed between the second lens unit and the linear polarizer.
In some embodiments, in the head-mounted display, the second lens unit further includes a buffer layer disposed between the second curved lens and the second transflective layer.
In some embodiments, the buffer layer has a waviness of less than about 50urad (micro radians) or a surface shape precision of less than about 10 microns in the head-mounted display.
In some embodiments, in the head-mounted display, the material of the buffer layer is a hard coat layer, a resin, or a combination thereof.
In some embodiments, the buffer layer has a thickness of less than about 10 microns in the head-mounted display.
In some embodiments, the head-mounted display further comprises a second phase retarder disposed between the second lens unit and the linear polarizer.
In some embodiments, the first phase retarder has a first fast axis and the second phase retarder has a second fast axis, and the first fast axis and the second fast axis are in the same direction or perpendicular to each other in the head-mounted display.
Drawings
In order to make the aforementioned and other objects, features, advantages and embodiments of the present disclosure more comprehensible, the following description is given:
fig. 1A illustrates an exploded view of a display module and an optical module of a head mounted display according to some embodiments of the present disclosure.
Fig. 1B is a schematic diagram of optical paths of a display module and an optical module of the head-mounted display of fig. 1A.
Fig. 2 illustrates an exploded view of a display module and an optical module of a head mounted display according to some embodiments of the present disclosure.
Fig. 3A illustrates an exploded view of a display module and an optical module of a head mounted display according to some embodiments of the present disclosure.
Fig. 3B illustrates an exploded view of a display module and an optical module of a head mounted display according to some embodiments of the present disclosure.
Fig. 3C illustrates an exploded view of a display module and an optical module of a head mounted display according to some embodiments of the present disclosure.
Fig. 3D is a schematic diagram of an optical path of the ambient light entering the optical module of the head-mounted display of fig. 3A, 3B, and 3C.
The reference signs are:
10 head-mounted display
12 eyes of the user
20 head-mounted display
30 head-mounted display
40 head-mounted display
50 head-mounted display
100 display module
110 display panel
200 optical module
210 first lens unit
212 first transflective layer
214 first curved lens
220 first phase retarder
222 quick shaft
230 second lens unit
232 the second curved lens
234 second semi-permeable and semi-reflective layer
236 buffer layer
240 linear polarizer
250 third lens unit
252 third curved lens
260 second phase delay plate
260' second phase delay plate
262 quick shaft
262' fast axis
Detailed Description
In order to make the description of the present disclosure more complete and complete, the following description is given for illustrative purposes, and for describing particular embodiments of the present disclosure; it is not intended to be the only form in which an embodiment of the present disclosure may be practiced or utilized. The various embodiments disclosed below may be combined with or substituted for one another where appropriate, and additional embodiments may be added to one embodiment without further recitation or description.
In the following description, numerous specific details are set forth to provide a thorough understanding of the following embodiments. However, embodiments of the present disclosure may be practiced without these specific details. In other instances, well-known structures and devices are shown schematically in order to simplify the drawing.
Additionally, the present disclosure may repeat reference numerals and/or letters in the various embodiments. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Furthermore, in the following disclosure, one feature may be formed on, connected to, and/or coupled to another feature, and may include embodiments in which the features are in direct contact, and may also include embodiments in which another feature may be formed and interposed between the features, such that the features may not be in direct contact.
Furthermore, spatially relative terms, such as "upper," "lower," "above," "below," and the like, may be used herein to describe one element or feature's relationship to another element or feature in the figures. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. Devices may also be translated in other orientations (rotated 90 degrees or other orientations) and thus the spatially relative descriptors used herein should be interpreted similarly.
Referring to fig. 1A, the head-mounted display 10 includes a display module 100 and an optical module 200. The display module 100 includes a display panel 110. The optical module 200 is located at the light-emitting side of the display module 100. In the light emitting direction from the display module 100 or the direction toward the user's eye 12, the optical module 200 sequentially includes a first lens unit 210, a first phase retarder 220, a second lens unit 230, a linear polarizer 240, and a third lens unit 250.
In some embodiments, the display panel 110 of the display module 100 may be a light emitting diode panel (e.g., an organic light emitting diode panel) or a liquid crystal display screen.
In some embodiments, the first lens unit 210 includes a first transflective layer 212 and a first curved lens 214. In some embodiments, the first curved lens 214 is a convex-concave lens, wherein the side facing the display module 100 is convex and the side facing the first retarder 220 is concave. The first transflective layer 212 is disposed on a side of the first curved lens 214 facing the display module 100, i.e., on a convex surface of the first curved lens 214. The first transflective layer 212 is configured to transmit a portion of light therethrough and reflect a portion of light. The first transflective layer 212 has a transmittance of 50 + -10% and a reflectance of 50 + -10%. The transmittance and reflectance of the first transflective layer 212 may be adjusted according to the overall stack structure and material characteristics of the optical module 200, so that the optical module 200 can obtain the best optical effect. The first curved lens 214 is used for transmission, filtering, adjusting the focal length of light, or magnifying an image. In some embodiments, the material of the first curved lens 214 may be glass or plastic. The material of the plastic lens may be, for example, polymethyl methacrylate (PMMA), Cyclic Olefin Copolymer (COC), or the like.
In some embodiments, the material of the first transflective layer 212 may be a non-metal, a metal, or a composite multilayer of a metal and a non-metal. The non-metallic material may be, for example, silicon dioxide (SiO 2). The metal material may be, for example, titanium pentoxide (Ti3O 5). The composite multi-layer material of metal and non-metal may be, for example, Si3N4, Nb2O5, TiO2, ZrO2, ZnSnO3, SiO2, Ti3O5, or the like, or combinations thereof, utilizing multiple layers of different high and low index materials to form a multi-layer stack. In some embodiments, disposing the first transflective layer 212 on the convex surface of the first curved lens 214 may use plating.
In some embodiments, the first phase retarder 220 is an 1/4 wave plate. The first retardation film 220 is used to change the polarization state of light, such as converting circularly polarized light into linearly polarized light, or converting linearly polarized light into circularly polarized light. In some embodiments, the fast axis 222 of the first phase retarder 220 is oriented at an angle of +45 degrees with respect to the pass axis of the subsequent linear polarizer 240. In an alternative embodiment, the fast axis 222 of the first retarder 220 is oriented at-45 degrees to the pass axis of the subsequent linear polarizer 240 (not shown).
In some embodiments, the second lens unit 230 includes a second curved lens 232 and a second semi-permeable and semi-reflective layer 234. The second curved lens 232 is a convex-concave lens, wherein the side facing the first phase retarder 220 is convex and the side facing the linear polarizer 240 is concave. The second curved lens 232 is used for transmission, filtering, adjusting the focal length of light, or magnifying an image. The material of the second curved lens 232 may be glass or plastic. The material of the plastic lens may be, for example, polymethyl methacrylate (PMMA), Cyclic Olefin Copolymer (COC), or the like.
The second transflective layer 234 is disposed on a side of the second curved lens 232 facing the linear polarizer 240, that is, on a concave surface of the second curved lens 232. The second semi-transparent and semi-reflective layer 234 is used to transmit part of the light and reflect part of the light. The second transflective layer 234 has a transmittance of 50 + -10% and a reflectance of 50 + -10%. The transmittance and reflectance of the second transflective layer 234 can be adjusted according to the overall stack structure and material characteristics of the optical module 200, so that the optical module 200 can obtain the best optical effect, for example, the contrast of the image can be improved.
In some embodiments, the material of the second semi-permeable and semi-reflective layer 234 may be a non-metal, a metal, or a composite multi-layer of a metal and a non-metal. The non-metallic material may be, for example, silicon dioxide (SiO 2). The metal material may be, for example, titanium pentoxide (Ti3O 5). The composite multi-layer material of metal and non-metal may be, for example, Si3N4, Nb2O5, TiO2, ZrO2, ZnSnO3, SiO2, Ti3O5, or the like, or combinations thereof, utilizing multiple layers of different high and low index materials to form a multi-layer stack. In some embodiments, disposing the second semi-transparent and semi-reflective layer 234 on the concave surface of the second curved lens 232 may use plating. In some embodiments, the first transflective layer 212 and the second transflective layer 234 are formed of the same material, so the manufacturing process of the optical module 200 is more consistent. In other embodiments, the first transflective layer 212 and the second transflective layer 234 may be formed of different materials.
In some embodiments, the linear polarizer 240 has a transmission axis, and the linear polarizer 240 is configured to allow the polarized light having the same polarization direction as the transmission axis to pass through, while the polarized light having the polarization direction orthogonal to the transmission axis of the linear polarizer 240 cannot pass through the linear polarizer 240, so that the contrast of the image can be improved and the generation of the ghost can be reduced.
In some embodiments, the third lens unit 250 includes a third curved lens 252. The third curved lens 252 is a convex-concave lens, wherein the side facing the linear polarizer 240 is convex and the side facing the user's eye 12 is concave. The third curved lens 252 may be selectively disposed in the optical module 200. The third curved lens 252 may be used to correct aberrations, change magnification, or compensate for optical visual effects. The material of the third curved lens 252 may be glass or plastic. The material of the plastic lens may be, for example, polymethyl methacrylate (PMMA), Cyclic Olefin Copolymer (COC), or the like.
Referring to fig. 1A and 1B, the component configuration and optical path of the head mounted display 10 are illustrated separately. First, light emitted from the display panel 110 of the display module 100 carries image information and is linear light, and after passing through a phase retardation plate (not shown) in the display module 100, the light emitted from the display module 100 is circularly polarized light.
The circularly polarized light from the display module 100 enters the optical module 200. First, the circularly polarized light passes through the first lens unit 210 of the optical module 200, and the light passing through the first transflective layer 212 of the first lens unit 210 has unchanged optical polarization. The circularly polarized light then passes through a first phase retarder 220, the first phase retarder 220 being an 1/4 plate, which rotates the circularly polarized light by 45 degrees (pi/4) to produce vertically linearly polarized light. The vertically linearly polarized light then passes through the second transflective layer 234 of the second lens unit 230 without changing the polarization of the light. Then, the partially transmitted vertically linearly polarized light is orthogonal to the linear polarizer 240, so it cannot transmit the linear polarizer 240. In addition, the polarization direction of the partially reflected vertically polarized light is not changed, and then the linearly polarized light is rotated by 45 degrees (pi/4) through the first phase retarder 220 to generate right-handed circularly polarized light. Then, the right-handed circularly polarized light passes through the first transflective layer 212 of the first lens unit 210, wherein the polarization of the partially transmitted right-handed circularly polarized light is not changed, and the polarization direction of the partially reflected right-handed circularly polarized light is changed to left-handed circularly polarized light. The left-handed circularly polarized light passes through the first phase retarder 220 to rotate the left-handed circularly polarized light by 45 degrees (pi/4) to generate a linearly polarized light, and the polarization direction of the linearly polarized light is changed to the horizontal direction. The horizontally linearly polarized light passes through the second semi-transparent and semi-reflective layer 234 of the second lens unit 230 without changing the phenomenon of linear polarization, and then passes through the linear polarizer 240 because the partially transmitted horizontally linearly polarized light is aligned with the direction of the transmission axis of the linear polarizer 240. Then, the linearly polarized light in the horizontal direction passes through the third lens unit 250 and then reaches the user's eye 12.
That is, by providing the second semi-permeable and semi-reflective layer 234 on the concave surface of the second curved lens 232 of the second lens unit 230, the light passing through the first lens unit 210, the first phase retarder 220, and the second curved lens 232 of the second lens unit 230 may be partially reflected, and the partially reflected light passes back through the first phase retarder 220, the first curved lens 214, is partially reflected by the first semi-permeable and semi-reflective layer 212, and then passes through the first phase retarder 220, the second curved lens 232 of the second lens unit 230, and the second semi-permeable and semi-reflective layer 234, at which time the direction of linear polarization of the light coincides with the transmission axis of the linear polarizer 240, and thus can pass through the linear polarizer 240. That is, after entering the optical module 200, the light emitted from the display module 100 undergoes two reflections and three passes through the first phase retarder 220(1/4 wave plate) to reach the user's eye 12. The light emitted from the display module 100 cannot pass through the linear polarizer 240 without being folded by the optical path.
In the conventional optical module of the head-mounted display, a transflective polarizer is required, for example, between the lens unit and the linear polarizer. In contrast, according to the embodiment provided by the present disclosure, by disposing the transflective layer on the concave surface of the curved lens of the second lens unit 230, the light can be reflected twice in the optical module and the polarization direction can be changed. Therefore, the whole thickness of the head-mounted display can be reduced without arranging a transflective polarizer.
Referring to fig. 2, a head mounted display 20 according to some alternative embodiments is depicted. The head mounted display 20 of fig. 2 is substantially similar to the head mounted display 10 of fig. 1A, except that a buffer layer 236 is disposed between the second curved lens 232 and the second transflective layer 234 of the second lens unit 230.
In some embodiments, the lens is manufactured by an injection molding process, so the surface is easily uneven. Due to the large waviness of the surface of the material of the lens, the imaging quality of the optical module is poor; the attachment yield of the concave surface of the lens and the semi-transparent and semi-reflective layer is poor; therefore, the buffer layer 236 disposed on the second curved lens 232 can reduce the surface waviness, make the surface smoother, and improve the adhesion between the second curved lens 232 and the second transflective layer 234. In some embodiments, the material of the second curved lens 232 is polymethyl methacrylate (PMMA), the surface is less scratch-resistant, and the buffer layer 236 can also provide a protection function.
In some embodiments, the material of the buffer layer 236 may be, for example, a hard coating or a resin, such as: inorganic coatings, silicone coatings, fluorocarbon paints, multifunctional acrylates, thermosetting resins, the like, or combinations thereof. In some embodiments, the thermosetting resin may be, for example, a blend resin material containing C, O, Si. In some embodiments, buffer layer 236 has a thickness of less than about 10 microns, such as between about 2 microns and about 10 microns. If the thickness of the buffer layer 236 is too thin, for example less than about 2 microns, the effect of the unevenness of the second curved lens 232 may not be filled. The thickness of the buffer layer 236, if too thick, e.g., greater than about 10 microns, may be less well controlled in the process or may be prone to chipping. In some embodiments, the waviness of the buffer layer 236 is less than about 50urad, or the surface shape Precision (PV) of the buffer layer 236 is less than about 10 microns.
The arrangement of other elements of the head mounted display 20 and the optical path direction are substantially the same as those of the head mounted display 10 in fig. 1A and 1B, and thus the description is not repeated here.
Referring to FIG. 3A, a head mounted display 30 is shown according to some alternative implementations. The head mounted display 30 of FIG. 3A is substantially similar to the head mounted display 10 of FIG. 1A, except that a second phase retarder 260 is disposed between the second lens unit 230 and the linear polarizer 240.
In some embodiments, the second phase retarder 260 is an 1/4 wave plate. The second phase retarder 260 is used for converting circularly polarized light into linearly polarized light, or converting linearly polarized light into circularly polarized light. In some embodiments, the fast axis 262 of the second phase retarder 260 is oriented at an angle of +45 degrees to the pass axis of the linear polarizer 240. In an alternative embodiment, the fast axis 262 of the second phase retarder 260 is oriented at-45 degrees to the transmission axis of the linear polarizer 240 (see, e.g., 260 'and 262' of FIG. 3C). The direction of the fast axis 262 of the second phase retarder 260 makes an angle with the direction of the transmission axis of the linear polarizer 240 that is not +45 degrees or-45 degrees, which is not optimal for ambient stray light shielding. In some embodiments, the first fast axis 222 of the first phase retarder 220 is in the same direction as the second fast axis 262 of the second phase retarder 260 (see fig. 3A and 3B) or perpendicular to each other (see 260 'and 262' of fig. 3C); if the first fast axis 222 and the second fast axis 262 are not in the same direction or perpendicular to each other, the circularly polarized light after the linearly polarized light passes through the second phase retarder 260 is biased, and the brightness of the image is reduced after passing through the linear polarizer 240.
Referring to FIG. 3A, in the optical module 200 of the head-mounted display 30, a first fast axis 222 of the first phase retarder 220 and a second fast axis 262 of the second phase retarder 260 have the same direction. In the optical module 200 of the display 50, the linear light is changed into the right circularly polarized light after passing through the second phase retarder 260', and then changed into the horizontal linearly polarized light after passing through the linear polarizer 240.
Since the head-mounted display is affected by the surrounding environment during the use process, when the stray light of the environment enters the optical module 200, the user may see unnecessary image information, such as generating ghost images. Moreover, since the second transflective layer 234 is disposed on the second lens unit 230, the stray light of the environment may generate disturbing image information through the second transflective layer 234, thereby affecting the visual effect.
The arrangement of the other elements of the head mounted display 30 is substantially the same as the head mounted display 10 in fig. 1A, and thus the description is not repeated here.
Referring to fig. 3A and 3D, it is shown that light in the ambient light, which is parallel to the transmission axis of the linear polarizer 240, can penetrate the linear polarizer 240 and then be converted into circularly polarized light by the second phase retarder 260. The circularly polarized light is reflected by the second transflective layer 234, the rotation direction of the circularly polarized light is changed, and the circularly polarized light is converted into linearly polarized light by the second phase retarder 260, and the linearly polarized light cannot pass through the linear polarizer 240 because the polarization direction of the linearly polarized light is perpendicular to the transmission axis direction of the linear polarizer 240.
Accordingly, by disposing the second phase retardation plate 260 between the second lens unit 230 and the linear polarizer 240, the interference of ambient stray light can be reduced.
Referring to fig. 3B, a head mounted display 40 is shown, according to some alternative embodiments. The head mounted display 40 of fig. 3B is substantially similar to the head mounted display 30 of fig. 3A, except that a buffer layer 236 is disposed between the second curved lens 232 and the second transflective layer 234 of the second lens unit 230. Therefore, the surface waviness can be reduced, and the adhesion between the second curved lens 232 and the second transflective layer 234 can be improved. The buffer layer 236 of fig. 3B is similar to the buffer layer 236 of the head mounted display 20 of fig. 2 and thus will not be described repeatedly herein.
Referring to fig. 3C, a head mounted display 50 according to some alternative embodiments is shown. The head mounted display 50 of FIG. 3C is substantially similar to the head mounted display 40 of FIG. 3B, except for the angle of the second fast axis 262 'in the second phase retarder 260'. In the optical module 200 of the display 50, the fast axis 262 'of the second phase retarder 260' is oriented at an angle of-45 degrees with respect to the transmission axis of the linear polarizer 240. Furthermore, a first fast axis 222 of the first retarder 220 and a second fast axis 262 'of the second retarder 260' are oriented perpendicular to each other. In the optical module 200 of the display 50, the linear light passes through the second phase retarder 260' and then becomes left-handed circularly polarized light, and then passes through the linear polarizer 240 and then becomes horizontal linearly polarized light.
The head mounted display provided by the present disclosure may be applied to devices for virtual reality, such as virtual real-mirror helmets, virtual real-mirror glasses, or the like. The semi-transparent and semi-reflective layer is arranged on the concave surface of the curved lens of the second lens unit, so that the optical visual effect can be improved and the manufacturing cost can be reduced under the condition that a semi-transparent and reflective polaroid is not required to be arranged. The optical module can also realize the light path folding and the image amplification of the image light beam from the display in the optical module, thereby reducing the thickness of the head-mounted display and facilitating the wearing of a user. Furthermore, the buffer layer is arranged between the curved lens and the semi-transparent and semi-reflective layer, so that the imaging quality can be improved, and the bonding rate of the semi-transparent and semi-reflective layer and the concave surface of the curved lens can be improved. In addition, the phase retardation plate can be additionally arranged between the second lens unit and the linear polarizer so as to reduce the interference of external environment light and improve the imaging quality.
While the foregoing is directed to embodiments of the present disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (11)
1. A head-mounted display, comprising:
a display module; and
the optical module sets up display module's light-emitting side, the optical module is along display module's light-emitting direction contains according to the preface:
a first lens unit, wherein the first lens unit comprises a first curved lens and a first transflective layer, the first curved lens has a first surface facing the display module and a second surface facing away from the display module, and the first transflective layer is disposed on the first surface;
a first phase retarder;
a second lens unit, wherein the second lens unit comprises a second curved lens having a third surface facing the first phase retarder and a fourth surface facing away from the first phase retarder, and a second semi-transparent and semi-reflective layer disposed on the fourth surface; and
a linear polarizer.
2. The head-mounted display of claim 1 wherein the second transflective layer has a transmittance of 50% ± 10% and a reflectance of 50 ± 10%.
3. The head-mounted display of claim 1, further comprising a third lens unit disposed on a side of the linear polarizer opposite the second lens unit in a light exit direction of the display module.
4. The head-mounted display of claim 1, wherein the second transflective layer directly contacts the second curved lens of the second lens unit.
5. The head-mounted display of claim 1, wherein no transflective polarizer is disposed between the second lens unit and the linear polarizer.
6. The head-mounted display of claim 1, wherein the second lens unit further comprises a buffer layer disposed between the second curved lens and the second transflective layer.
7. The head-mounted display of claim 6, wherein the buffer layer has a waviness of less than 50urad or a surface shape precision of less than 10 microns.
8. The head-mounted display of claim 6, wherein the buffer layer is a hard coat, a resin, or a combination thereof.
9. The head-mounted display of claim 6, wherein the buffer layer has a thickness of less than 10 microns.
10. The head-mounted display of claim 1, further comprising a second phase retarder disposed between the second lens unit and the linear polarizer.
11. The head-mounted display of claim 10, wherein the first phase retarder has a first fast axis and the second phase retarder has a second fast axis, the first fast axis and the second fast axis being in the same direction or perpendicular to each other.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210581107.4A CN114839781A (en) | 2022-05-26 | 2022-05-26 | Head-mounted display |
| TW111120324A TWI813318B (en) | 2022-05-26 | 2022-05-31 | Head-mounted display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210581107.4A CN114839781A (en) | 2022-05-26 | 2022-05-26 | Head-mounted display |
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| CN114839781A true CN114839781A (en) | 2022-08-02 |
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| CN202210581107.4A Pending CN114839781A (en) | 2022-05-26 | 2022-05-26 | Head-mounted display |
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| CN114706226B (en) * | 2022-04-29 | 2023-12-12 | 业成科技（成都）有限公司 | Virtual reality display system and head-mounted display device |
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| TW202346966A (en) | 2023-12-01 |
| TWI813318B (en) | 2023-08-21 |
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